package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.DishDTO;
import com.sky.dto.DishPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.DishFlavor;
import com.sky.entity.Setmeal;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.mapper.DishFlavorMapper;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.result.PageResult;
import com.sky.service.DishService;
import com.sky.vo.DishVO;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.ArrayList;
import java.util.List;

@Service
@Slf4j
public class DishServiceImpl implements DishService {

    @Autowired
    private DishMapper dishMapper;

    @Autowired
    private DishFlavorMapper dishFlavorMapper;

    @Autowired
    private SetmealDishMapper setmealDishMapper;
    @Autowired
    private SetmealMapper setmealMapper;

    /**
     * 新增菜品和口味数据
     * @param dishDTO
     */
    @Transactional
    @Override
    public void saveWithFlavor(DishDTO dishDTO) {

        // 向菜品表插入1条数据
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO, dish);
        dishMapper.insert(dish);

        // 获取insert语句生成的主键值
        Long dishId = dish.getId();

        List<DishFlavor> flavors = dishDTO.getFlavors();
        if(flavors != null && flavors.size() > 0) {
            flavors.forEach(flavor -> {flavor.setDishId(dishId);});
            // 向口味表插入n条数据
            dishFlavorMapper.insertBatch(flavors);
        }

    }

    /**
     * 菜品分类查询
     * @param dishPageQueryDTO
     * @return
     */
    @Override
    public PageResult page(DishPageQueryDTO dishPageQueryDTO) {
        PageHelper.startPage(dishPageQueryDTO.getPage(), dishPageQueryDTO.getPageSize());
        Page<DishVO> page =  dishFlavorMapper.pageQuery(dishPageQueryDTO);
        return new PageResult(page.getTotal(), page.getResult());
    }

    /**
     * 菜品批量删除
     * @param ids
     * @return
     */
    @Transactional
    @Override
    public void deleteBatch(List<Long> ids) {
        // 判断是否能被删除，起售中
        for(Long id : ids) {
            Dish dish = dishMapper.getById(id);
            if(dish.getStatus() == StatusConstant.ENABLE) {
                // 处于起售中，不能删除
                throw new DeletionNotAllowedException(MessageConstant.DISH_ON_SALE);
            }
        }
        // 判断是否能被删除，是否被套餐关联
        List<Long> setmealIds =  setmealDishMapper.getSetmealIdsByDishIds(ids);
        if(setmealIds != null && setmealIds.size() > 0) {
            // 当前菜品被套餐关联，不能删除
            throw new DeletionNotAllowedException(MessageConstant.DISH_BE_RELATED_BY_SETMEAL);
        }
        // 删除菜品表的菜品数据
        //删除菜品关联的口味数据
//        for(Long id : ids) {
//            dishMapper.deleteById(id);
//            dishFlavorMapper.deleteById(id);
//        }
        // 优化 delete from dish where id in (1, 2, 3)
        // 根据菜品id集合批量删除菜品
        dishMapper.deleteByIds(ids);
        dishFlavorMapper.deleteByIds(ids);
    }

    /**
     * 根据id查询菜品
     * @param id
     * @return
     */
    @Override
    public DishVO getByIdWithFlavor(Long id) {
        // 根据id查菜品
        Dish dish = dishMapper.getById(id);
        // 根据菜品id查口味id
        List<DishFlavor> dishFlavors = dishFlavorMapper.getByDishId(id);
        // 封装到VO
        DishVO dishVO = new DishVO();
        BeanUtils.copyProperties(dish, dishVO);
        dishVO.setFlavors(dishFlavors);
        return dishVO;
    }

    /**
     * 修改菜品和对应口味信息
     * @param dishDTO
     * @return
     */
    @Override
    public void updateWithFlavor(DishDTO dishDTO) {
        // 修改菜品表基本信息
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO, dish);
        dishMapper.update(dish);
        // 删除原有的口味数据
        Long dishId = dishDTO.getId();
        dishFlavorMapper.deleteById(dishId);
//        System.out.println("---------------------------------------------");
        // 从新插入口味数据
        List<DishFlavor> flavors = dishDTO.getFlavors();
        if(flavors != null && flavors.size() > 0) {
            //可能没传过来，设置上dishId
            flavors.forEach(flavor -> {flavor.setDishId(dishId);});
            // 向口味表插入n条数据
            dishFlavorMapper.insertBatch(flavors);
        }

    }

    /**
     * 修改起售状态
     * @param status
     * @return
     */
    @Override
    public void startOrStop(Integer status, Long id) {
        Dish dish = Dish.builder()
                .id(id)
                .status(status)
                .build();
        dishMapper.update(dish);
        // 如果是停售，套餐也不能售卖
        if(dish.getStatus() == StatusConstant.DISABLE) {
            List<Long> dishIds = new ArrayList<>();
            dishIds.add(id);
            List<Long> setmealIds = setmealDishMapper.getSetmealIdsByDishIds(dishIds);
            if(setmealIds != null && setmealIds.size() > 0) {
                for(Long setmealId : setmealIds) {
                    Setmeal setmeal = Setmeal.builder()
                            .id(setmealId)
                            .status(StatusConstant.DISABLE)
                            .build();
                    setmealMapper.update(setmeal);
                }

//                setmealMapper.setStatusIds(setmealIds);
            }
        }
        // 如果是起售，套餐里需要全是起售才能售卖
//        else {
//            List<Long> dishIds = new ArrayList<>();
//            dishIds.add(id);
//            List<Long> setmealIds = setmealDishMapper.getSetmealIdsByDishIds(dishIds);
//            if(setmealIds == null || setmealIds.size() == 0) return ;
//            for(Long setmealId : setmealIds) {
//
//            }
//        }

    }

    /**
     * 根据分类id查菜品
     * @param categoryId
     * @return
     */
    @Override
    public List<Dish> list(Long categoryId) {
        Dish dish = Dish.builder()
                .categoryId(categoryId)
                .status(StatusConstant.ENABLE)
                .build();

        return dishMapper.list(dish);
    }
    /**
     * 条件查询菜品和口味
     * @param dish
     * @return
     */
    public List<DishVO> listWithFlavor(Dish dish) {
        List<Dish> dishList = dishMapper.list(dish);

        List<DishVO> dishVOList = new ArrayList<>();

        for (Dish d : dishList) {
            DishVO dishVO = new DishVO();
            BeanUtils.copyProperties(d,dishVO);

            //根据菜品id查询对应的口味
            List<DishFlavor> flavors = dishFlavorMapper.getByDishId(d.getId());

            dishVO.setFlavors(flavors);
            dishVOList.add(dishVO);
        }

        return dishVOList;
    }
}
